WO2014207389A1

WO2014207389A1 - Use of a 2-octyl acrylate polymer as a binding agent in a coating composition

Info

Publication number: WO2014207389A1
Application number: PCT/FR2014/051615
Authority: WO
Inventors: Reinhard Linemann; Isabelle Betremieux; Jean-Yves Loze; Alain Boone
Original assignee: Arkema France
Priority date: 2013-06-28
Filing date: 2014-06-26
Publication date: 2014-12-31
Also published as: CN105324347A; EP3013767A1; BR112015031262B1; FR3007767A1; JP6329258B2; EP3013767B1; JP2016524020A; FR3007767B1; KR20160025584A; US20160152751A1; CN105324347B; BR112015031262A2; ZA201508869B; MY179975A; SG11201510604VA; MX2015017334A; US9593191B2

Abstract

The present invention relates to the use of a polymer from the polymerisation of 2-octyl acrylate of renewable origin and optionally at least one other monomer, as a binding agent in or for the production of a coating composition.

Description

USE OF A 2-OCTYL ACRYLATE POLYMER AS A BINDER AGENT IN A COATING COMPOSITION

TECHNICAL FIELD The present invention relates to the use of a polymer resulting from the polymerization of 2-octyl acrylate and optionally at least one other monomer, as a binding agent in or for the manufacture of a composition of coating.

BACKGROUND OF THE INVENTION

It is known to apply acrylic-type paints to surfaces, especially building facades, not only to beautify them and prevent the deposition of dirt, especially dust, but also to protect them from infiltration. rainwater. To this end, the coating must be able to adhere properly to the surface, to deform easily without risk of cracking and not to have stickiness.

An example of a paint composition having the above-mentioned compromise of properties has been disclosed in application EP 0 599 676. This composition contains a polymer resulting from the polymerization of three distinct monomers, consisting in particular of a mixture of (meth) acrylic acid, a (meth) acrylic acid ester, such as n-butyl acrylate, and a benzophenone derivative, and optionally a fourth monomer which is styrene. Another type of paint composition has been described in US 2012/0121921. It is a flame-retardant and water-resistant polymer composition, comprising a polymeric binder in latex form, obtained by radical polymerization of at least one ethylenically unsaturated monomer, especially comprising n-butyl acrylate, and tert-butyl (meth) acrylate.

Acrylic compounds, optionally associated with styrene, have the further advantage of allowing the formulation of paints with good resistance to light and weather conditions. However, they are usually produced from propylene, which is a by-product of petroleum refining. Oil deposits are running out quickly. To anticipate the supply difficulties related to these resources, it would be desirable to be able to substitute these acrylic compounds with compounds obtained from carbon sources of renewable origin.

To meet this need, it has been proposed in application WO 2012/084974 to use as a binder in paints a dispersion of two vinyl polymers containing at least 10% by weight of monomers of renewable origin such as acrylate. n-butyl. It is indicated that this binder makes it possible to obtain a flexible paint that dries at low temperature and is not sticky.

However, it has been found by the Applicant that n-butyl acrylate does not contain sufficient carbon of renewable origin and that it has a more hydrophilic character than long-chain acrylates such as 2-octyl acrylate. . After much research, the Applicant has demonstrated that it is possible to formulate a coating composition in film form, based on polymer of predominantly renewable origin, which composition has both good mechanical properties, and in particular a flexibility and elongation and a good cohesion, as well as a sufficiently hydrophobic character, using as a binder a homo- or copolymer based on 2-octyl acrylate.

Such a compound has already been described, in particular, in the application WO 2012/038441 as constituent of an impact modifier and in the documents WO 2008/046000, WO 2009/079582, WO 2009/132098 and WO 2009/129087 as constituent of a pressure-sensitive adhesive.

In US 4,983,454, an acrylic resin, based on 2-octyl acrylate and other (meth) acrylic monomers, prepared in an aqueous solvent is used as a barrier coating interposed between, on the one hand, a metallic substrate coated with a layer of paint obtained by electroplating, and secondly, an upper layer of paint. The acrylic resin has a glass transition temperature of -52 ° C and an elongation at break at -20 ° C of 610%. This coating is presented as flexible, adhesive, and above all capable of absorbing energy to protect the composite material against shocks, the latter advantageously constituting an automotive paint.

The Applicant has now discovered that it is possible to use 2-octyl acrylate of renewable origin to prepare a copolymer having particular properties well adapted to form a binder in coating compositions, this coating having properties identical to those obtained with monomers from the petrochemical industry.

SUMMARY OF THE INVENTION

The present invention thus relates to the use of a polymer resulting from the polymerization of 2-octyl acrylate of renewable origin and possibly at least one other monomer, as binding agent in or for the manufacture of a coating composition. DETAILED DESCRIPTION OF EMBODIMENTS

In this invention, it is proposed to use a particular polymer as a binder in a coating composition.

By "coating" is meant, in the present description, a layer applied to a substrate in film form, generally between 50 mm and a few mm thick, from a Tg-binding polymer of between -40 ° C. and + 40 ° C according to the law of Fox, said film being applied in a sufficient thickness to modify the appearance of the substrate, in particular its optical properties, and / or protect its surface, in particular against scratches, moisture, Dirt or light.

The term "coating composition" therefore does not include adhesive compositions intended to improve adhesive properties of the substrate. On the other hand, it includes paint, mortar, coating, varnish and ink compositions, without this list being limiting.

In addition, in this description, the expression "included between" is understood to include the aforementioned bounds as well as all intermediate values, and the expression "from to" is understood to exclude the aforementioned bounds.

The polymer used according to the invention comprises 2-octyl acrylate of renewable origin. This monomer is mainly, or even entirely, derived from plant sources and can therefore be considered as a material of renewable origin, which is characterized by the fact that its content of ¹⁴ C represents at least 50%, preferably at least 60%, for example at least 70 ~ 6, or even at least 80%, that of atmospheric CO ₂ (according to ASTM D6866). In other words, the 2-octyl acrylate contains at least 0.6 x 10 ^{~ 10} % by weight of ¹⁴ C relative to the total carbon, according to ASTM D6866-06. The ¹⁴ C content can be measured according to a liquid scintillation counting method and expressed as disintegrations per minute per gram of carbon, or dpm / gC. The dpm / gC value of the 2-octyl acrylate is generally at least 7.2 ± 0.1 dpm / gC. The 2-octyl acrylate may be prepared from 2-octanol and acrylic acid, especially in the presence of an acid-type esterification catalyst comprising sulfur, such as methanesulfonic acid, and at least a polymerization inhibitor. Alternatively, it can be prepared by transesterification reaction between a light acrylate such as ethyl acrylate, and 2-octanol. The 2-octanol may itself be derived from the treatment of ricinoleic acid, derived from castor oil, with sodium hydroxide, followed by distillation to remove sebacic acid. A process for the preparation of 2-octyl acrylate by direct esterification is described in particular in application WO 2013/064775.

The aforementioned monomer can be homopolymerized, in which case the polymer used according to the invention is a homopolymer of 2-octyl acrylate. As a variant, it may be copolymerized with at least one other monomer, so that the polymer used according to the invention is a copolymer containing, advantageously, from 1 to 80% by weight, preferably from 25 to 75% by weight, and more preferably 30 to 75%, or even 50 to 70% by weight, of 2-octyl acrylate, relative to the total weight of the copolymer.

Furthermore, the use of monomers, themselves at least partly of plant and / or animal origin, consolidates the bio-sourced nature of the copolymer containing 2-octyl acrylate.

This other monomer can in particular be chosen from: vinylaromatic monomers, such as styrene; ethylenically unsaturated nitriles, such as

Acrylonitrile; esters of ethylenically unsaturated mono- and dicarboxylic acids, such as 2-ethylhexyl acrylate, n-butyl acrylate and methyl methacrylate, itaconic acid esters; esters of monocarboxylic acid and of vinyl or allylic alcohol, such as vinyl acetate; ethylenically unsaturated mono- and dicarboxylic and sulphonic acids, such as (meth) acrylic acid, itaconic acid and styrene sulphonic acids; ethylenically unsaturated mono- and dicarboxylic acid amides, such as acrylamide; N-vinyllactams, such as N-vinyl pyrrolidone; N-vinylamides; N, -diallylamines; N, -diallyl-N-alkylamines; substituted allyl or vinyl nitrogen heterocycles, such as N-vinylimidazole and vinyl- and allylpyridines; and their mixtures. Preferred comonomers are ethylenically unsaturated mono and di-carboxylic acid esters, in particular methyl methacrylate and n-butyl acrylate, vinylaromatic monomers, more particularly styrene, and mixtures thereof.

Other functional or crosslinking monomers may be advantageously added to the 2-octyl acrylate before polymerization, in order to improve the chemical resistance properties to water or to various household products of the coating composition. These monomers can also improve the barrier or fouling resistance properties of the coating composition, or improve the mechanical properties of the polymer such as its resistance to elongation. Among the crosslinking monomers, non-limiting mention may be made of diacetone acrylamide in combination with adipic acid bishydrazide, hydroxylated monomers in combination with polyisocyanates, siloxane (meth) acrylates, and multifunctional (meth) acrylates. , that is to say having several unsaturations, and mixtures thereof. Of the monomers functional, non-exhaustively include acetoxyethyl (meth) acrylates, monomers carrying phosphate or phosphonate function (s), monomers bearing ureido function (s), monomers carrying amino function (s) and their mixtures.

The monomers constituting the polymer used according to the invention can be polymerized in a conventional manner, for example by means of a radical polymerization in aqueous emulsion. The pH of the emulsion can be buffered to be maintained between 4 and 7 during the polymerization process. As free-radical initiators, those conventionally used in this type of reaction may be chosen, and in particular inorganic initiators such as ammonium, sodium and potassium persulfates, alone or in combination with a reducing agent intended to lower the polymerization temperature, or still organic initiators such as tert-butyl hydroperoxides or hydrogen activated by reducing agents. Depending on the targeted properties, one or more chain transfer agent (s) may be added during the process to achieve the desired molecular weight distribution. The polymerization can be carried out at a temperature of 0 to 150 ° C, preferably 30 to 100 ° C and for example 50 to 90 ° C, for a period of 4 to 6 hours, for example. It can be conducted under atmospheric pressure and / or in the presence of an inert gas. This polymerization process results in a latex advantageously having a solids content of between 20 and 70% by weight and preferably between 35 and 60% by weight. The polymer obtained generally has a glass transition temperature (Tg), calculated using the Fox's law, of between -40 ° C. and + 40 ° C., preferably ranging from -30 ° C. to + 30 ° C., more preferably between -10 and 10 ° C, or between -10 and 0 ° C.

The polymer can be obtained in a one-step process, that is to say with a continuous feed into a single monomeric composition, or in a multi-step process using different monomeric compositions, in order to obtain particles presenting different Tg domains. This type of particles is referred to as core-shell particles or structured particles. In this case, the average Tg of the polymers obtained at the end of each step may also be between -40 ° C. and + 40 ° C. and preferably ranging from -30 ° C. to + 30 ° C.

In addition to this polymer, the coating composition used according to the invention contains water. It may contain various additives chosen for example from: one or more pigments; one or more powdery fillers; one or more pH adjusters, in particular one or more bases, for neutralizing the acidic monomers optionally copolymerized with 2-octyl acrylate, such as an alkaline hydroxide (in particular sodium hydroxide), aqueous ammonia or a water-soluble amine; one or more dispersing and / or wetting agents, such as sodium, potassium or ammonium polyphosphates and naphthalene sulfonic acid salts; one or more thickeners, such as xanthan and cellulose derivatives; one or more anti-foam agents; one or several film-forming agents; one or more antifreeze agents; one or more flame retardants, especially organophosphorus compounds or magnesium or aluminum hydroxide; one or more biocides; and their mixtures.

The pigments may in particular be chosen from: white or colored inorganic pigments, such as titanium dioxide, zinc oxide, barium sulfate, antimony trioxide, iron oxides, ultramarine and carbon black; organic pigments, such as azo dyes, indigoids and anthraquinoids; and their mixtures. The pulverulent fillers may especially be chosen from: calcium or magnesium carbonate; silica; silicates, such as talc, kaolin, mica; calcium sulphate, aluminosilicates; and their mixtures. These charges are preferably implemented in finely divided form.

In addition, particularly in the case where it is used for the manufacture of a coating, the coating composition according to the invention may contain an additional binder, in particular a silicone resin or a silicate.

The various constituents of the coating composition can be mixed in a conventional manner for those skilled in the art, in their usual proportions. It is preferred that the polymer is added, generally in the form of an aqueous dispersion (latex), in a dispersion or paste of pigments. The polymer in the form of an aqueous dispersion generally represents from 5 to 90% by weight, preferably from 10 to 75% by weight, relative to the total weight of the composition. In dry weight, the polymer generally represents from 5 to 50% by weight, and preferably from 20 to 40% by weight, relative to the total weight of the composition. This composition may be in liquid or semi-solid form.

It preferably has a solids content of between 25 and 75% by weight and preferably between 35 and 65% by weight.

The composition used according to the invention can be applied to any substrate, especially wood, metal, glass, cement, paper, textile, leather, plastic or brick, by any means, including using a brush, a brush, a roller, a buffer, a spray or an aerosol, possibly after application to the substrate of an adhesion primer.

It then forms on this substrate a film at room temperature (<30 ° C), to give it the desired aesthetic properties and to protect it, especially against moisture.

The invention will be better understood in the light of the following nonlimiting examples, which are intended to illustrate the invention and not to limit its scope, defined by the appended claims.

EXAMPLES

Example 1 Preparation of Polymer Dispersions

A. General operating procedure

1) Raw materials

For the preparation of the polymers according to the invention, the raw materials indicated in Table 1 below were used.

Table 1

Consti¬

Function Chemical Nature Killing Supplier

Emulsify ^R Tensio-Alkane sulfonate

Rhodia E30 active Sodium

Sodium sulphate

Disponil ^R Tensio- fatty alcohol

BASF FES77 ethoxylated active

(30% in water)

Mix of alcohols

Disponil ^R Tensio-ethoxylated fats

BASF

A3065 linear assets

(65% in water)

Fatty alcohol

Emulan ^R Tensio-ethoxylated BASF TO4070 active

(70% in water) Table 1 (continued)

Consti¬

Function Chemical Nature Killing Supplier

2-ethyl acrylate

AE2H Arkema Hexyl Monomer

Acrylate of 2-

A20ct Arkema octyle Monomer

ABu Monomer Arkyl Butyl Acrylate

Methacrylate

MAM Arkema Methyl Monomer

AA Acrylic Acid Monomer Arkema

AMA Monomer Arkema methacrylic acid

Acrylamide Monomer 2-propenamide Cytec

(2-hydroxypropyl)

HPMA Monomer BASF methacrylamide

hydroxyethyl

HEMA Monomer BASF Methacrylate

Triethylene glycol

TEGDMa Monomer BASF dimethacylate

Methacrylate

Mallyl BASF lant allyle

MercaponDDM N-dodecylmercaptan Acros tan

persulfate

(NH4) 2S208 Ammonium Aldrich Peroxide

Reduc ^¬ Metabisulfite

Na2S205 Sodium Proloader

Neutra ^¬

NaOH Sodium hydroxide Prolabo reading

methylisothiazolin

Acticide (MIT) and

Biocide Thor MBS Benzisothiazolinone

(BIT) The Tg of the polymers was calculated as follows, according to the law of Fox:

1 / Tg = xVTg ¹ + x ² / Tg ² + ... x ⁿ / Tg ⁿ where x is the mass fraction of monomer Tg considered and the glass transition temperature of its homopolymer. In the following tests, the values mentioned in Table 2 below are used:

Table 2

2) Installation

The syntheses were carried out in a reactor of 3 1 (internal capacity) glass, equipped with a double jacket, equipped with an effective stirring (vortex), a refrigerant with triple flow, a control and a regulation of the material temperature. The reactor included the number of inlet connections necessary for the separate introduction of the various components, as well as an introduction dedicated to inerting. to the nitrogen of the whole. The tightness was checked before each synthesis. The installation was equipped with a system to adjust the introduction rates of the components. The temperature of the material, as well as the temperatures of the jacket, were recorded and adjusted. The synthesis was carried out semi-continuously.

3) Methods for characterizing dispersions a) Dry extract (ES)

The solids content of the aqueous dispersions was measured according to the ISO 3251 standard.

b) p_H

The pH of the aqueous dispersions was measured according to ISO 976.

c) Viscosity

The viscosity of the aqueous dispersions was measured according to ISO 2555.

d) Particle size

Particle size was measured by Photon Correlation Spectroscopy (PCS), using Beckman Coulter N4 + apparatus. The sample was diluted (3 to 5 drops of emulsion in 50 ml of water) in a polystyrene tank with deionized water on a 0.22 μιη cellulose acetate filter. The particle size was measured at a temperature of 25 ° C, a measurement angle of 90 ° and a laser wavelength of 633 nm. e) Minimum film formation temperature (TMF) measured and expected according to the structuration or otherwise of the particle The TMF of aqueous dispersions was measured according to ISO 2115.

B. Syntheses made A first polymer dispersion, hereinafter referred to as "Dispersion D1", was prepared as follows.

15.25 g of a 40% solution of Emulsifier E30 were solubilized in 1165.85 g of demineralized water at the bottom of the tank. The pH of the bottom of the tank was advantageously less than 3. The temperature of the bottom of the tank was raised to 80 ° C.

Separately, a pre-emulsion was prepared by dispersing 44.38g of Emulsifier E30 (40%) and 83.33g of Disponil FES 77 (30%) in 865.04g of deionized water with good agitation.

We added in turn and under good agitation:

- 1007, 5g of MAM

- 1462, 5g of A20ct

The pre-emulsion thus formed was white and stable for at least the time of the polymerization. She was kept under slight agitation.

Finally, various catalyst solutions were prepared as follows.

SI: 1.25 g of ammonium persulfate were solubilized in 11.25 g of water.

S2: 1.50 g of ammonium persulfate were solubilized in 148.50 g of water.

S3: 1.25 g of ammonium persulfate were solubilized in 123.75 g of water. S4: 2 g of sodium metabisulfite were solubilized in 198 g of water. The polymerization was conducted in the following manner. i) Seeding

In the stock foot containing the initial charge, stable at 80 ° C., 270.1 g of the pre-emulsion described above were introduced for seeding. Once the temperature stabilized at 80 ° C, 100% of the SI solution, 12.5 g, was added. The maximum of exothermia marked the end of this stage. The particle size was about 60 nm and the conversion was greater than 70%. ii) Polymerization

The rest of the pre-emulsion, as well as 5g of Mallyl and 25g of AA, were fed for 210 minutes at a polymerization temperature of 82 ° C.

The solution S2, ie 150 g, was cast in parallel in 255 min. iii) Stage of consumption of the residual monomers

The temperature was maintained for 15 minutes at 82 ° C. At the end of the thermal cooking, we poured separately and in parallel:

- in 45 minutes, the solution S3, that is 125g

in 75 minutes, the solution S4, that is 200g, always at 82 ° C. This redox treatment was followed by baking at 82 ° C for 20 minutes before cooling to room temperature. iv) Final additions

At 30-35 ° C, the latex was neutralized by adding sodium hydroxide to pH 8-9 before adding a biocide. It was then adjusted to dry extract and filtered on 100mm canvas. The final dry extract amounted to

47.6%.

A Dl dispersion comprising a MAM / A20ct / AA / Mallyl-based polymer was obtained in the mass proportions 40.3 / 58.5 / 1 / 0.2, with a Fox Tg of 0 ° C.

The final particle size was about 130 nm, the viscosity was less than 1000 mPa.s, the measured TMF was 5 ° C.

The list of other aqueous dispersions prepared on the basis of the same procedure is shown in Table 3 below, with indication of compositions which varied from one test to another.

Table 3

In these three tests, 68.5 g of methacrylic acid was added to the pre-emulsion and Mallyl was replaced by a transfer agent, nDDM, at 0.025 parts.

C. Physico-chemical characterization of dispersions

The characteristics of the dispersions D2 to D4 obtained are collated in Table 4 below.

Table 4

D2 D3 D4

Dry extract (%) 50.0 54.8 55.1 pH after neutralization 8 8 8.2

Viscosity at 20 rpm (mPa.s) 120 1630 1750

Temperature (° C) 20 21 20

Mobile 1 2 3

Particle size (nm) 145 160 160

IP 0.05 0.001 0.007

TMF (° C) 0 5 5 Example 2: Physical Properties

Each dispersion obtained in Example 1, in film form, was applied to a polypropylene plate (800 μm hum) and dried for 7 days at 23 ° C. at 50% relative humidity.

The following tests were then performed:

Dynamic Mechanical Analysis (DMA): A Mettler DMA861e apparatus was used in shear mode, with a temperature sweep of -50 ° C to 200 ° C. The temperature rise ramp was 3 ° C / min, the frequency of 1 Hz.

Mechanical Tests: An MTS traction machine set at a temperature of 23 ° C, a relative humidity of 50%, a test speed of 500 mm / min, with a 50 N cell and a dumbbell test tube was used.

The results obtained are collated in the following Table.

Table 5

Ech. DMA Traction at 500 mm / min at 23 ° C

Ctr rupt. Allong. Mod. Young (MPa) Rupt. (%) (MPa)

Ta Tan5 E '(Pa) Val. AND Val. AND Val. ET (° C) to

100 ° C

D2 18 2.14 1.6 x 4.69 0.49 463 17 19 0.4

10 ⁴

D3 23 1.84 2.3 x 6.61 0.19 409 17 35 0.8

10 ⁴

D4 20 1.93 1.5 x 5.04 0.20 480 14 18 0.3

10 ⁴ It can be seen from this table that the differences between the dispersions tested are extremely small, so that the mechanical and viscoelastic properties of the films are considered equivalent. The use of larger amounts of A20ct does not alter them.

Example 3: Application Evaluation a. Formulation of varnishes

Varnishes were formulated using the raw materials identified in Table 6 below.

Table 6

The dispersions prepared in Example 1 were formulated as a varnish (35% solids content) having the following compositions: Varnish VI:

b. Evaluation of the water resistance

Varnishes VI to V3 above were applied to a glass plate (200 μm hum) and dried for 7 days at 23 ° C., 50% RH. At the end of the 7 days, a drop of water was deposited on the surface of the lacquer film and left in contact therewith for 15 minutes, 30 minutes, 1 hour, 2 hours, 8 hours and 24 hours. The bleaching of the film in contact with water was then evaluated according to the following rating scale: 0 = no bleaching, 1 = slight bleaching, 2 = medium bleaching, 3 = intense bleaching.

As can be seen, the V3 varnish (formulated from the dispersion D4 which contains the bio-sourced A20CT monomer) has a water resistance equivalent to the Varnish VI which is formulated with the dispersion D2 containing no bioconomous monomer. source.

EXAMPLE 4 Three other aqueous dispersions were prepared according to the same procedure as in Example 1.

The compositions and characteristics are collated in Table 7 below: Table 7

The mechanical tests as described in Example 2 were applied to these 3 dispersions, as well as tensile tests at 5 mm / min performed at -20 ° C.

The results are summarized in Table 8 below. These tests show that dispersions D5 and D6 have a very low elongation at break at -20 ° C compared to dispersion D7 which has a Tg of -56 ° C. Table 8

Ech. DMA Traction at 500 mm / min at 23 ° C

Ctr rupt. Elong. Rupt. Mod. Young (MPa) (%) (MPa)

Your Tanô E 'to Val. AND Val. AND Val. And (° C) 100 ° C

(Pa)

D5 33 2.10 16, 5 12 1.6 214 29 259 11 x 10 ⁴

D6 13 1.48 36, 3 5.41 0, 35 834 53 1.1 0, 01 x 10 ⁴

D7 -27 2, 02 1.26 Unable to determine

comp X 10 ⁴

Traction at 5 mm / min at -20 ° C

Ctr rupt. Elong. Rupt. Mod. Young (MPa) (%) (MPa)

Val. AND Val. AND Val. AND

D5 34 6 3.5 0, 6 1020 63

D6 22 0.1 207 7 419 16

D7 2.1 0, 09> 1100 1.1 0.2 comp

Claims

1. Use of a polymer resulting from the polymerization of 2-octyl acrylate of renewable origin and optionally at least one other monomer, as binding agent in or for the manufacture of a coating composition, characterized in that the polymer has a glass transition temperature (Tg), calculated by Fox's law, between -40 ° C and + 40 ° C.

2. Use according to claim 1, characterized in that said other monomer is chosen from: vinylaromatic monomers such as styrene; ethylenically unsaturated nitriles, such as acrylonitrile; esters of ethylenically unsaturated mono- and dicarboxylic acids, such as 2-ethylhexyl acrylate, n-butyl acrylate, methyl methacrylate, itaconic acid esters; esters of monocarboxylic acid and of vinyl or allylic alcohol, such as vinyl acetate; ethylenically unsaturated mono- and dicarboxylic and sulphonic acids, such as (meth) acrylic acid, itaconic acid and styrene sulphonic acids; ethylenically unsaturated mono- and dicarboxylic acid amides, such as acrylamide; N-vinyllactams, such as N-vinyl pyrrolidone; N-vinylamides; N, -diallylamines; N, -diallyl-N-alkylamines; substituted allyl or vinyl nitrogen heterocycles, such as N-vinylimidazole and vinyl- and allylpyridines; and their mixtures.

3. Use according to claim 2, characterized in that said other monomer is chosen from esters ethylenically unsaturated mono and dicarboxylic acids, in particular methyl methacrylate and n-butyl acrylate, vinylaromatic monomers, more particularly styrene, and mixtures thereof.

4. Use according to any one of claims 1 to 3, characterized in that the polymer has a glass transition temperature (Tg), calculated by Fox's law, ranging from -30 ° C to + 30 ° C, plus preferably between -10 and + 10 ° C or between 0 and -10 ° C.

5. Use according to any one of claims 1 to 4, characterized in that the polymer is a copolymer containing, from 30 to 75%, and more preferably from 50 to 70% by weight, of 2-octyl acrylate, relative to the total weight of the copolymer.

6. Use according to any one of claims 1 to 5, characterized in that the coating composition is a paint composition, mortar, coating, varnish or ink.

7. Use according to any one of claims 1 to 6, characterized in that the polymer represents, by dry weight, from 5 to 50% by weight, and preferably from 20 to 40% by weight, relative to the total weight of the composition.